Collaborative Research: White Dwarfs in Binaries Across the H-R Diagram with the APOGEE-GALEX-Gaia Catalog

合作研究：使用 APOGEE-GALEX-Gaia 目录在 H-R 图上的双星中的白矮星

• 批准号: 2307865
• 负责人: Carlos Badenes
• 金额: $ 10万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2307865&HistoricalAwards=false
• 关键词: Collaborative; Research; White; Dwarfs; Binaries

More than 95 percent of stars will eventually end up as white dwarfs - the remains of stars that have used up their nuclear fuel and collapsed to a size equivalent to Earth but with a mass comparable to the Sun. Many of these white dwarfs are locked in a cosmic dance with stellar companions, where they orbit around each other and exchange mass. Such close white dwarf binary systems offer an excellent opportunity to study the late stages of stellar evolution. They can also be used as tracers of the dynamics of the Milky Way galaxy, and they are potential sources of gravitational waves. The goal of this project is to collect data on these systems at a wide range of wavelengths to characterize them and investigate fundamental properties, like what they are made of and how much mass they are sharing. This work will also provide several projects for science students at various stages, and the investigators will work with experts in accessibility to create training programs to teach astronomy to blind and visually impaired people. Most white dwarfs inhabit multiple systems, and a large fraction of those are compact enough to exchange mass, changing the structures and subsequent evolution of both stars. The physical mechanisms that mediate these mass exchanges include common envelope evolution, Roche lobe overflow, wind accretion, mass stripping, and stellar mergers. The main goal of this proposal is to further our understanding of mass transfer processes in interacting systems by assembling a unique observational sample of thousands of post mass-transfer binaries. The source sample combines the GALEX and Gaia databases with APOGEE — a high resolution (R=22,500), high signal-to-noise, multi-epoch, infrared (1.51 μm to 1.69 μm), spectroscopic survey of stars across the Milky Way — to build the most exhaustive survey of post-mass transfer binaries, containing systems with main sequence, subgiant, red giant, and red clump companions. The creation of this APOGEE-GALEX-Gaia Catalog and the proposed analysis of the resulting data set will improve our knowledge of the population of post-mass transfer binaries containing a white dwarf, and map the changes in their properties as a function of the evolution of the non-degenerate companion.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

超过95%的恒星最终将成为白色矮星--恒星的残骸已经耗尽了它们的核燃料，坍缩到与地球相当的大小，但质量与太阳相当。这些白色矮星中的许多都被锁定在与恒星同伴的宇宙舞蹈中，在那里它们围绕彼此旋转并交换质量。如此接近的白色矮双星系统为研究恒星演化的后期阶段提供了绝佳的机会。它们也可以被用作银河系动力学的示踪剂，它们是引力波的潜在来源。该项目的目标是在广泛的波长范围内收集这些系统的数据，以表征它们并研究基本属性，例如它们是由什么组成的以及它们共享多少质量。这项工作还将为不同阶段的理科学生提供几个项目，研究人员将与无障碍专家合作，制定培训计划，向盲人和视障人士教授天文学。大多数白色矮星居住在多个系统中，其中很大一部分足够紧凑，可以交换质量，改变两颗恒星的结构和随后的演化。调节这些质量交换的物理机制包括普通包层演化、洛希瓣溢出、风吸积、质量剥离和恒星合并。这项建议的主要目标是通过组装一个独特的观察样本的数千个后质量传递二进制进一步了解相互作用系统中的质量传递过程。源样本结合了GALEX和盖亚数据库与APOGEE -一个高分辨率（R= 22，500），高信噪比，多历元，红外（1.51 μm至1.69 μm），对银河系恒星的光谱调查-建立最详尽的质量转移后双星调查，包括主序星，次巨星，红巨星和红团伴星。这个APOGEE-GALEX-Gaia星表的创建和对所得数据集的拟议分析将提高我们对包含白色矮星的后质量转移双星群体的认识，并绘制它们的性质变化，作为非物质进化的函数，该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准。